-Half
of material decomposed on surface is added to upper 2 inches
-Incorporated
biomass
Mass of roots per unit depth
increases in first three inches to a maximum and then decreases over a depth
of 15 inches regardless of stage of growth or plant type.
Killing causes live roots to
become dead roots and begin to decay.
A decrease of root biomass
during year is assumed to be root sloughing and adds to the dead root pool.
Root sloughing causes a
build up of biomass in the soil that is a function of location, more where
decomposition is less.
A portion of the residue
decomposed on the surface is arbitrarily added to soil biomass in upper 2
inches.
